Across: 4 Daley Thompson, 7 Bucket, 8 Exponent, 9 Giga, 12 Array, 13 Punched, 14 Angle, 15 Dots, 17 Accounts, 20 Amount, 21 Semiconductor.

Down: 1 Peeks, 2 Statement, 3 Issue, 4 Debugging aids, 5 Minor, 6 N p n transistor, 10 Ape, 11 Thousands, 12 Add, 16 Music, 18 Comma, 19 Torch.